From Orange (A7 Orange Center motorway exit):

Take the National 7 towards Valence / Lyon and cross the city.
At the exit of Orange you will cross the river L'Aygues.
From there, count 1 km and you will find the sign indicating Château Beauchêne on your right.

From Piolenc:

Take the National 7 towards Orange.
After the Craft Zone on your left, you will find the sign indicating Château Beauchêne on your left.